Ejector device



H. J. MILLER EIJECTOR DEVICE Oct. 26, 1954 Filed March 29, 1952 IN V ENTOR.

Patented Oct. 26, 1954 lTED STATES PATENT OFFICE 5 Claims. 1

This invention relates to an ejector device suitable for use wherever itis desired to force a liquid or any type of fluid out of a tank withconsiderable velocity.

One object of the invention is to produce a high vacuum in an ejectordevice which will closely approximate 30 inches.

Another object of the invention is to vary the degree of vacuum in orderto suit the particular nature of the work in which the ejector device isused.

A further object of the invention is to afford visual means to indicatethe degree of vacuum obtained with the ejector device.

Still another object of the invention is to provide an ejector devicecomprising a minimum of parts and of maintenance consonant with a highdegree of efiiciency.

These and other objects of the invention may be attained by means of theconstruction illustrated in the accompanying drawing in which:

Figure 1 is an elevation of the ejector device and Figure 2 is avertical section therethrough.

Referring to the drawing more in detail, the ejector device comprises abody l0, preferably of cast brass although any other suitable materialmay be used. The body H] has a cylindrical bore l l therein terminatingin an upper enlarged chamber l2 having internal threads I 3 tothreadedly receive a pipe or hose (not shown) supplying a liquid orother fluid under high pressure to the bore ll of the body. The lowerend of the body I is internally threaded at M to receive the upperthreaded end l5 of a nozzle element [5. This nozzle element comprises anupper extension ll having a smooth cylindrical peripheral portion l8beneath the threads Hi. This smooth portion I8 is enlarged at [9 to forma ledge normally spaced from the bottom end 2! of the body ill. Theclearance between ledge 20 and bottom end 21 is for the purpose ofpermitting adjustment of the nozzle element 46 within the body forreasons to be further explained. A gasket 36 is positioned between ledge20 and end 2| to prevent leakage therethrough.

The enlargement I 9 is provided with peripheral threads 22 adapted toreceive a sleeve 23 having internal threads cooperating with threads 22.

The bottom end of the sleeve is internally enlarged at 24 to receive thebottom flange 25 of the sleeve 23'. After the device has beencalibrated, the flange 25 and the enlargement 24 are soldered as shownat 34 so that the sleeve 23 and the nozzle "5 will rotate as a unit. Theupper end of the sleeve is tapered at 26 towards the body I 0 toprovide, a fine upper edge 21. The taper 26 carries indicia showing itsdivision into 360. These indicia cooperate with an index and stop mark28 carried by the body It] in proximity to the fine edge 21. In thismanner, the upper end of the sleeve 23 constitutes a vernier from whichreadings may be had of the position of the nozzle element 16 within thebody [0.

The nozzle element has an internal bore therethrough comprising an upperconical chamber 29, as shown, having a throat or constriction 32. Fromthis constriction, the inner walls of the bore taper outwardly anddownwardly, as shown at 3|, to the bottom end of the nozzle element. Ithas been found that in order to secure the best results, the length ofthe nozzle bore should not be less than five times the diameter of thethroat 30 nor more than 10 times the said diameter.

The walls of the body l0 are provided with an opening 32 adapted tosnugly receive a jet tube 33. This tube is preferably soldered or brazedat 34' to the outer wall of the body It. After entering the bore H ofthe body, the jet tube is bent downwardly with the axis of this bentportion coinciding with the axis of the bore H. The bent portion of thejet tube terminates within the conical chamber 29 of the nozzle bore.

The ejector device operates as follows: The upper end of the body l0being connected to a source of fluid under pressure, a high suction iscreated at the throat 30 through conversion of pressure head intovelocity head. The result is forced ejection of the fluid admittedthrough the jet tube 33. It has been found that with a in. throat, thevelocity head has sufficient force to eject liquid a distance of 42feet. The corresponding or resulting kinetic energy released sets up ahigh vacuum at the point of approach between the jet tube 33 and thebore of the nozzle. The jet tube acts as a choke or valve and theclosely regulated choking or valve action permits a re-forming of thestream after the velocity head is established.

The adjustability of the nozzle permits the location of the nozzle boreselectively at such distances from the outlet of the jet tube as tosecure any desired results. Furthermore, the location of the nozzle maybe observed on the vernier and the settings may be recorded forsubsequent uses.

Following a series of experiments with the instant device, it has beenfound that a vacuum of from 30 to 31 in. has been attained with thewalls of the conical chamber 29 making an included angle of approach ofbetween 40 and 50.

While a single embodiment of the features of the present invention hasbeen shown herein, it is not intended to limit the invention thereto asother embodiments may come within the scope of the appended claims.

What is claimed is:

1. An ejector device comprising a body, means for admitting pressurefluid to said body at the upper end thereof, a nozzle threadedat thelowerend of the body, said nozzle having a conical inner chamber at itsupper end and an axial passage tapering outwardly from said chamber tothe lower end of the nozzle, a jet tube protruding through the body andhaving an opening within said conical chamber, a sleeve mountedoutwardly of the body, and connecting means between said sleeve and saidnozzle whereby the sleeve rotates the nozzle to vary the distancebetween the conical chamber and the. opening of, the jet tube.

2. An ejector deviceas set forth in claim 1, wherein the inner walls ofthe conical chamber make an angle of from 40 to 50? with thelongitudinal axis of the body.

3. An ejector device as set forth in claim 1, wherein the conicalchamber and the axial passage in the nozzle form a throat in the planein which they meet, the length of said passage being comprised between 5and lo times the diameter of the throat.

4. An ejector device comprisinga body, means for admitting pressurefluid'to said body, a nozzle in said body having an ejector passagetherethrough, a jet tube in said body having an opening adjacent saidpassage, means for adjusting the nozzle in the body to vary the distancebetween the opening of the jet tube and the ejector passage, means forindicating the amount of such adjustment including a rotatable sleevemounted on said body, and means for connecting the sleeve to the nozzle,whereby the nozzle is rotated by the sleeve for adjusting the nozzle inthe body 5. Anejector device comprising a body, means for admittingpressure fluid to said body, a nozzlein said body having an ejectorpassage therethrough, a jet tube in said body having an opening adjacentsaid passage, means for adjusting thenozzlein the body to vary thedistance between the opening of the jet tube and the ejector passage andmeans for indicating the amount of suchadjustment including a rotatablesleeve mounted on the body, connecting means between the sleeve and thenozzle, whereby the sleeve and nozzle are rotatable together, theindicating means comprising-indicia between said sleeve and body.

References-Citedin-the file of this patent UNITED STATES PATENTS.

Number; Name, Date 54,615 Shapley May 8, 1866 1,449,873, Steuben Mar.27, 1923 1,835,603 Kincaid Dec. 8, 1931 FOREIGN PATENTS Number Country-Date 613,014; Great Britain Nov. 22, 1948

